UI issues? I guess that Exodus fixed that problem, and I doubt that the old wallets such as Electrum & Multibit have any plans to change their UI though, It doesn't look like their first priority &
TumbleBit should fix the anonymity problem, don't know If a soft fork is required or not. Now, for the price, I believe that most of people are using bitcoin just because of the instability because they are seeing it as an investment more then a currency, not to mention that big whales manipulate the market as well so stability could be something hard to get IMO.